Granting Permissions to the MSMQ Service from a Secondary JAMS Scheduler

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There may be situations where it is necessary to have a Secondary JAMS Scheduler send MSMQ messages to the Primary JAMS Scheduler, and vice-versa. In an HA (highly-available) environment, MSMQ messages are sent to both schedulers by each scheduler by default, but permissions to allow this are not enabled and must be assigned manually.

In order to enable this, simply give both machines SYSTEM account permissions to the "jamsrequests" private queue on both of the JAMS Scheduler servers.

The Message Queuing section in Windows Server is located in the Features section of the Server Manager console. The "jamsrequests" private queue can be found there.

Permissions to the jamsrequests private queue can be adjusted by right clicking on it Properties -> Security tab.

The JAMS installer does not add additional permissions by default. Add the "SYSTEM" account of each machine to the permissions list for the jamsrequests private queue.  

Note: it is necessary to "Take Ownership" of the 'jamsrequests' private queue before modifying its permissions, and then ownership can be returned to its original owner after the permissions have been changed.

 

This is only necessary if the JAMS services are running under Local System. If the JAMS Services are running under a Domain account, simply make sure that the Domain account has access to each private queue. 

The remote system only needs to be able to send messages to the local system. Therefore, only "Send Messages" permission is needed. No additional steps need to be taken.

This configuration is useful for cases where both Primary and Secondary JAMS Schedulers are behind a Virtual IP (VIP). Since it will be transparent which JAMS Scheduler will be connected, it is important to be able to submit instructions to the Scheduler that is actively running. Adding this functionality will allow one Scheduler to concurrently send MSMQ Messages to the other.

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